Silencer



Feb. 4, 1936. J LA'UBACHER 2,030,008

SILENCER Filed Aug. 10, 1934 Patented Feb. 4, 1936 UNITED A STATES PATENT. OFFICE Application-August 10, 1934, Sci-Isl No. 739,338 In Germanyootober 9, 1833 The invention concerns a silencer divided intov several separate channels for the exhaust of combustion engines. .The known silencers have the disadvantage, that they either attain an insumcient silencing eiiect or offer a very big resistance to' the exhausting combustion gases. 1 Further disadvantages consist in the fact, that they can be cleaned onLv with difllculty, ornot st el] of the soot or other residues of combustion which accumulate therein. Hereby the efliciency of the combustion engines is reduced. Moreover, these silencers are generally very troublesome in construction and expensive in producing them.

Accordingto the invention, these disadvantages are removed in that, on the silencer, provided with several separate flow channels, ahollow constructed wall of the separate now channels is filled with a sound-absorbing structural materialand is partitioned intersected byfone or several inlet-openings or channels in such a manner that one of said separate ilo'w channels. having shortening its length, is led into another 0! the separate flowchannels iar from the entering-place of the gases into thesilencer. 7 The drawing. schematically shows several ex- 1 amples oi construction of the object o! the invention: I I

Fig. 1 shows a form of construction oi the silencer providedwith soundabsorblng insertion in the outerside walls of the spiral shaped inner partition wall in -longitudinal section-partly in. side elevation. i

Fig. 2 shows the same form of construction in cross section on the line IIII of Fig. l. f

Fig. 3 shows the same form of construction in longitudinal section on thellne lTlIm of Fig. l.

Fig, shows the same form of constructlonin view as men from the exhaust side. Pig. 5 shows another form of construction of 40 the silencer with sound absorbing insertion in the spiral titted inside. I I

6 shows the same mm of construction in cros sectiononthe line VI--VI of Fig. 5. I is the outer casing 01' the silencer which la 45 preferably constructed oi drop iorm or cylin-. drical design with rounded ends and formed by two halves Joined together by iolding. welding, soldering etc. At the inletplace for the exhaust gas the casing is provided with a .tube shaped to pipe-mull 2 which is detachably connected to the exhaust'pipe oi the combustion engine in question, by means oi a bayonet lock. clamping clips or such means. Between ,the parallel side walls of theicasing I, a spirally shaped member is arranged, which. according to l 'lgab and 6 consist most suitably oi twisted thin plate walls 3 and ot-a porous substance 4 i'or example of long shredded thin steel chips, asbestos or the like pressed in between these walls. The

casing .l by otsuitabl'e screwing arrangement for example, angle pieces grooves in the side walls or such like. The end 0 ofithe spiral member 3- protrudes knifelike into the exhaust gas inlet pipe 2 and, in consequence of its flexibility is adjustable here-transversely to the direction 01- gas flow by means of an adjusting spiral members I, .l are held in position in the screw 1 outwardly protruding through the ex h'aust pipe 2. Owing to this adiustabllity oi the end i of the spiral member I, it is alter the proportion of the parts oi the gas cur-- rent toeach other whichare separated from each other bythe blade Q and consequently the vib'ra- .tion load of the spiral member walls by means or the divided current. Moreover, the spiral membet I can more or less be tensioned in this way. Theplatewallsl oithemembers 3,4 mayalsobe provided with holes in "ordento make them more flexible provided they are made somewhat stronger.

Inthe'case oi the-construction example according to Figs. 1-4, the spiral member is con structed as a simple (an ordinary) wall without sound absorbing insertion 4. 1h this case, the side walls! 01' the csp'iral member 3 are constructed hollow and are fllled'up with sound ab 7 sorbing insertion ii. In the last part of the passage oi the e channel formed by the spiral shaped member 3, outlet openings ll are provided in the, side. walls 9 which are'covered 5' by cap shaped bonnets II. The bonnets I: are provided withiexhaust openings '13 for the exhaust gases which are arranged at right angles to the outlet openings .1 The bonnets 12' are preferably constructed in a swallow-tail fashion; 40

' Itis recommendable to afllxone or both of them (ietachahly to thecasing l.

V The casing I is pro.-' vided with side-openings it of the size of the spiral member 3, and is provided with flanges l5 projecting outwardly over which the bonnets I2 overlap. In the case of rigid connection of. bonnet ll 'with the casing I, the bonnets may be pressed out or the casing I, or. produced with same as one piece orbe welded on to the me.

The casing l maybe constructed out of pressed so: plate strips or castings. The side flanges I! aswell as the bonnets l2 accommodate the side walls I with or without the sound absorbing insertion ii. In the beginning sphereoi the bypossible to 5 channels formed the blade I, a guide wall ii to 2 r isbuilt intothecasing I parallel totheblade I by means of which the by-cm-reint islead in the next following turning of'the main channel in the flow, direction ofthe exhaust Hie illustrated and described forms of-con struction may, with regards to shape, construction and arrangement of the single silencer parts,

be subjected to numerous alterations without leaving the scope-of the invention. I

Having now particularly described and ascertained the nature of my invention and in what manner the same'is to be performed, I declare that what I claim is:-

1-. In a device of the classdescrlbed, a silencer consisting of a single spiral main channel with an inlet opening at one end thereof and an outlet opening at the other end, and a shorter flow channel having its widesttransverse dimension substantially the same'as the widest transverse andoutlet or the main channel and-having the same direction of now as the main channeldimension of the main channel, opening into the main channel at a-point intermediate the inlet whereby the flow of the shorter channel causes in said main channel a reduction in pressure before the flow in said main channel reaches such point.

2. In a device of the class described, a silencer of a single spiral main'channel with an inlet opening at one end thereof andan outletbpening at'the other end, and a shorter flow channel having ltswidest in transverse dimension substantially the same as the widest transverse dimension of the main channel opening into the main channel at a point intermediate the inlet and outlet ofthe main channel and having the same direction of flow as the main channel whereby the flow of the shortercha'nnel causes in said main channel a reduction in pressure beg fore the flow in said main channel reaches such point,- parts of the walls of saidmain channel being of hollow construction and a sound absorbing substance in said h\ollowp arts oi said channel Gil -flowasthemain- 3. In a device of the class described, a casing having parallel wails,asilencer'in said casing con sisting of a single spiral main channel with an inlet opening at one end thereof and an outlet at the, other end, and a shorter flow channel having 'm'ain channel being built in between the parallel walls of-the casing, parts of the walls of said main channel being of hollow construction and a sound absorbing substance in said hollow parts of said channel walls. I

.4; In a device of the. having parallel walls, a silencer in the casing consisting of a single spiral main channel with an inlet opening at amend and an outlet opening at the other end, and a shorter flow channel having its widest transverse dimension substantially the same as the widest dimension of the main channel opening into the main s, oso,ooa 4 channel at a point intermediate the inlet and outclass described, a casing let of the main channel and having .the same direction of flow as the main channel whereby the'flow into said main channel through said shorter channel causes a reduction in pressure point, a wall of said main channel beingbuilt in between the parallel walls of the casingand latancl asound absorbing substance in said hollow parts of said channel walls.

5. In a device of the class described, a ,casing -having parallel walls, a silencer in the casing and consisting of a single spiral main channel with an inlet opening at one end and an outlet opening at the other end, and a shorter flow channel having its widest transverse dimension substantially the same as the widest transverse dimension of the main channel opening into the main channelat a point intermediate the inlet and outlet of the main channel and having the same .direction of flow as the main channel whereby the flow into said main channel through said shorter channel and outlet opening causes a reduction in before the flow in said main channel reaches said pressure before the flow in said mainchannel I reaches said point, a wall of said main, channel being built in between the parallel walls of the casing, parts of the walls of said main channel being of hollow construction, a sound absorbing substance in, said hollowparts of said channel walls and the two opposite side walls at the end of the main flow channel having at least one outlet opening therein.

6, In a device of the class described, a casing, a silencer in the casing consisting of a single spiral main channel having an inlet and outlet at opposite ends with a. second inlet intermediate the aforesaid inlet and outlet and a shorter flow channel opening into the main channel at the second inlet, the length of the main channel between the two inlets being greater than the length of the shorter channel, whereby the flow of the shorter channel causes a reduction in pressure in the main channel before the flow in the main channel reaches the second inlet, parts of the walls of said main channel being of hollow construction, and a sound absorbing substance in said hollow'parts of said walls.

'I. In a device of the class described, a casing,

a silencerin the casing consisting of a single spi'ral main channel having an inlet and outlet at opposite ends with a second inlet opening atan intermediate point, a shorter flow' channel opening into the main channel at the intermediate inlet, the length of the main channel between the two inlets being greater than the length of the shorter channel, whereby the flow of the shorter channel into said main channel causes a reduction in pressure in said main chann'elbefore the flow in said inain channel reaches the second inlet, parts of the walls of said main channelbeing of hollow construction, a sound absorbing'substancein said hollow parts of said channel 'walls and two opposite-walls at the end of the spiral flow channel having at least one opening therein, cap shaped parts forv covering said outlet openings inthe side walls and said capshaped parts having outlet openinss therein and being detachably arranged on the casing.

' Y JOSE! 

